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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6f8b4b7d05630582f4fdf998ebba87d36e6c99c22037d7360f7c3a7873ecc6b' 
  AND token = 'cfgo0gtN9uE3fHU0kVbnvCU7lxXSUw8VRIpJJKpWgAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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