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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ece8b1c86ab57fe7c0a085eb08dc5a9c348992febbe9988ebc5393b6ef9d6fbe' 
  AND token = 'rUixo2glwtjQIpSdDD26sU+fbVLofSGn5tZq6irZkgA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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