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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a73c4f0f9656677db9f53ef5ac9aa596f69d283f778f84ff24add012dd272dff' 
  AND token = 'hzzGqKShgqpvI0yLO0opUmVcy74v0TIaKeka1zWvz9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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