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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ba65457d1431032241c509ea10f73d5d1982b05f3ec99a6d9aed82c648b0f79' 
  AND token = '1Ztsr/n6TcshPWXiEBWOCVhQzUmx9P8MUr4sqAtrAwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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