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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8a97abd1116d77024ec92f86d916b0ea9dc98222a08ef0062c3021a1c98ae81' 
  AND token = 'sqwctdIFhoWf5awR/MCnKJFj5FVMbK66EHJLnqBQMW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}