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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aed6acdd7a4af4015c14400db6c5906de7c295491650f4ea8e69fc3573038df' 
  AND token = 'TcAuDfY/8OXkXNHb5xHvmNhpbP60VFutE0F21ivyW9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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