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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '666dec80b608b08bf6697ee6a8950151e14e65b5c30c4a89d1028b9e61d003b5' 
  AND token = 'tldPBgVDLdAf5KZDXpXLXmHo36W+0CI6xrPx/rGLC8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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