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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02705ce38be0d82362e1391b3b4379872a4b79e82edd73d3be4a8e72480c8c6e' 
  AND token = 'GczJfHeej4/ViGKzpfzvGEEEDcJFhZ/0GABnlWRYi4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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