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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a12bf88c812dc2c4259d43a199de6ee74fdc4c541b95ab03a3eb0444155ed777' 
  AND token = 'idnV0bxmn7DsQ5m1/0S4ynNmAVeYqXd1MPerT30xOMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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