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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '046db3c8eb1119221b43a708ee53552fc03aabf81420a6a5a8590617212f37f4' 
  AND token = '+J/z+Yx+lzWIZoAUi03J5ExzaIsQ8lyAxlO+lsYcPqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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