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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31e99edddf96252caf1297ca480ee29beaddd8905560f41cc379b301eb0350de' 
  AND token = 'GZ5uQECo3bapmAIVNe+FlEFgn3XzEHlvrJB6x6JP2vg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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