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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfc468ac4ffa7e0cde5c3ad92ebae4574d109bfaf4939c74b8e0628dbd7a16a6' 
  AND token = '89ZzRLec7CVOXexrkXrJF58fWNXi2IFXyHuQCWYurKU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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