SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d8f0a180f46173c72b00245a5c138a20b34fa5cad50deb0258f4fbb6909e566' 
  AND token = 'v+kO/R6HoI2H0ayIL9ZKsgfPKGdYVqz6Rx1NOAZrgks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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