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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '679b1f93f2da7d834e02808d9f0c68bb5d861c4f85c336afaf98c6a2053d0aec' 
  AND token = 'QvkjIOlzKEJRBfP1kvQEoyMbTIne2DLDu+VVFvog97g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00106

JSON explain

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