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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56b8b3917fa1daa6b91ba1de3a3ef429313e489c7a546b3e6eb3a15398076b0a' 
  AND token = '/uupUDs26XVH3YXdsxD8XUM0A23ueN9pEbw08sEtyyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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