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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd283a46d8ae297d78fa2bb353c27ef59e6f3f0216b4860ee02e460b2367b5826' 
  AND token = 'r9HfFv0FwgWRiYwdR2vivM1TxFFiWE5i98d4Ia8Pa8k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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