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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb37414c1481378dd7bed31d47d8e996fe84992c7ff71b64ad48a3a18c8969c8' 
  AND token = 'Bd8r9XK5oUO56YI3C9SGdyIVTfcGy0nZo7tsSntBggo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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