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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f86e69ec7c95dbff41cbc2595c48cd3511eb2f379beabb9d1c745a999ac6db63' 
  AND token = 'KtWW9Yu+YUGdagV5fUuvjEjT7xVJ55unGe057ymm8BM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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