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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43144b4fff27b60132aa9e7c2959bbc6ad3630f03f1ca1d159d23246a87dd1fa' 
  AND token = 'Yae5HspUzTWfQgI0Bm8N0mfaxh655Din5rNlQAeF78Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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