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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7155fdf5a7877083d1d638244e78dc8e025e64abffe26a6237ef0d6ea56879b' 
  AND token = 'ig2BeSz1yHrmC0ZHbdINdh6hm/hN3DNPhmqfZfdakpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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