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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a40d53080ea8797b91287a243298a46b96abae4178433999136e0e237e49cb80' 
  AND token = '9UuwrKZSlVo0dk2MMyjWqyrUFmwggCrOsaxa33sk1+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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