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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd556342ff43405c93717989ee2e502bedb762ebad338ad7f218da7a3c71a3057' 
  AND token = 'Ngus5d8ptKKOTM564VIrub6AIbmnxZk9VF68t3oKXnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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