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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa8afed590791804aeba30506ec65b466370b04420131ac7def35def047f41a6' 
  AND token = 'wdSANQtWM/b8Q7yvoFm8Aifb0M/M+3SEve0/BQTzru8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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