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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04bb3a75c89b6d596e60c77e23e28a0e4e2467d7cfaeacad633bccfacb2e61aa' 
  AND token = '8Hvyf6+L2eUMiHJ6yQzRLimcOw6hTtK9Lt4e9VZ32YA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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