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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93db40307844c822359470561f51b397cc466fefef5c4b45b40d9113ec3e8afb' 
  AND token = 'ggr/s1V5ONebjkhC7snwCRmtWObob+zYh431ywd6T5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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