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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fae2b8ea5520668ae9397ba677ae71f74b163280f4b8d087f98b77eec3ff6fc' 
  AND token = 'yGxLui0s9qnQOHAAtTeXcNNSPSJd+vQI+Y7T+VLwDVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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