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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c479e2835b8088ca71668f6c63309b3f0bb170954ab8c6b88571b985eb930ff4' 
  AND token = 'OMY1IY/TI0Y1mXdxu8e2oG54+LSSfN+kwlxefAuY3p0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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