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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15f663dd1894446a9096ae2238c92df81c557913c7ca3e35fcdb8fa4dc2b7389' 
  AND token = 'VEVptY4lhd5o6hl5up7WgWFrVqtsam9Lfuibr/Xee8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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