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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '571c0478855c0aa20d9201927fd1e797cf6384e9c088a21e9e67468083fae6a1' 
  AND token = 'h4fQu+F5f+P2yElLFeCc8F0FTMLfLNJp4RYJzX2t8lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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