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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69f9b870038a431d28874973d4e1d95ed8ee02f9cf5d64f28bda62ffc73db359' 
  AND token = 'm/14/kyhPICZHbGb2Ee9ywS1434C6hUdgQANyq3T80E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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