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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27da447137a4da0e7b4dddca9ce3131ea3961b2c24a464082ab1ab2d39f07e19' 
  AND token = 'CHYTpLicITk4+MQyvoPL5bEX/9aN8ONhQUjpVs+01ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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