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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25401adf3fcbeefc685414cc0f8a0572a0e3f94d90308a162509272fd5dcb668' 
  AND token = 'pxCipbqWZjxIYRddp4IfNIE9/f/oGbKWpf+7TwVMb9c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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