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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aec17bb1dd70f730477d1be9162bfe70679c4978883dc48ddc672a67d9977913' 
  AND token = 'OjK/6HWC0Ddcm8ZBzz9Vwz24ZMPoce9P1pVeDT0vyeI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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