Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6c0ceeb26e52ae14d78094ffc0cff735921bdd2396188d36f03ce8807b7fbf2' 
  AND token = 's9vjdrnLF3pVYOWme3KXgFe30m9U/seVrGMHzkmsS5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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