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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '118373c39531fa4e1ba6773ffcbc6fbcc119336c113dbdfb20812f45674d0966' 
  AND token = '5f6vWbp2+PBXs2IpgctN1WKJrtGg8rzLiVyqXX8OioE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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