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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '524549901faa70f10884738caf9e94f1793eaa8b3d6a0f6264f2285bcc3b3cf8' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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