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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '037baf86382e6608d7abbb7b64d51b2a0f9f8bf72ac9677134b99d57e93cb352' 
  AND token = 'P9ZaCyaYNSVZ1VR+1Y6hjVHekYAEEnI7QA1xwQHdttk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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