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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b31e853fc8db8d0ae6f50e5454834f00216376270682e0752bbab5fde7eef331' 
  AND token = 'YMUPo6uLVxbav+Hv3o20m75YVvtmVCoeis+Wz52TdY8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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