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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '801fde01e63769f8789cde6c20e1cf791a85a3388b13a32f333f326423fd1031' 
  AND token = 'FfKpSj7z5DZmqD98M8eukYvzrKoWCJu3aZa/dL3D2QM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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