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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99a32ab3fe7f8b3356a366cd1d2d09247477b8185a18dd00fe1e53e538987548' 
  AND token = 'urPm2M7XxPlUEEFl7FSG05z4gtZDLlj9kM78oPf3L0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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