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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5ec4044a112d199bd7bbec8cc6575dbb418772a7190adc971d191c51a2d3703' 
  AND token = 'KDdOkd7fzVXxRzNveDb9Ywn3bR9N1CoHmKgzgMnOv30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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