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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44c3dd3c01fcd63904a9065f070970e0eedb1e7d5259b3855e05cac39a043f3a' 
  AND token = '2WVeUPx7rG1a4cGhr04A0yXAxlUTQ8Vq7PhvdKWDsPc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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