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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cd8c58de878f04db9e7d50fa295c7e96579d2b6ad94ba6bef58f6bb2bc96b61' 
  AND token = 'vBK2ji1S0kWToZ92NvbtSRoyex5DkoJuWkq4FDRUOzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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