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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23ae38113f94d8b47879f71c7d043b79991f864ab4558819da0b2c87cc58ffcb' 
  AND token = 'nSrqm1dKl7dSKq9mSAiwkHjaUYDLnDbsl2p2pcMJeCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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