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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd30b0d08565b3c9f50f858a00d0ee75b191f6a1939edddedacd018ffe0f5f758' 
  AND token = '47yKvKoUIKEL2ZcwV1/bljTboPiPicMD7EFoeew9YKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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