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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc9ee7e5b27ca28c612bea9ecf672b4cf36b7d2795b08ed04e9e39d8a6fdce90' 
  AND token = 'jt+2EG6baTSyK5peM1HYb7Tcfl7Mn5VJ+BQ9frQtrLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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