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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c858c67e4c152470961d143591b58b047c1c62e042f316a08eb6eb371191c734' 
  AND token = 'qBJRV802kQe2WE0dF0DA4gWX1A7BgZzpK5k/F62P9BE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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