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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2975e5fc8978c967ddf4d82d2d65674f704d8460bf1e850b2daa0b53c1659a18' 
  AND token = 'VnCgNo1R2hRjdUdOedamubbOwn0L8WjdX1agC96kNCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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