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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79b3d26f28950a85ea870d2c24523407c6f05112e8bfa78635b2dd7bc2be6d32' 
  AND token = 'W+va+5LuZ27lVLl8Z7jneXAehxUIrhRtfz19L78tstM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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