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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf4f6bf3f07d44548e35f551b8090f68f30e158b077c12e969f283a675541176' 
  AND token = 'c6rymxcv9fGF2saErdR/YPUiJpq57nZI2otWtbPHyGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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