SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdb12b6c4f64fbcbeb1fa02b02a935bfa499750630c18a332337f588a5357e63' 
  AND token = 'sHL1zVUvM4vGdhkGzizq3p8PAs6sn6+ERJA3Q9hkfVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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