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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fa5ab06910bfd6f003a7c6eae0785167a1e3db48d4973a700a611b3c71233db' 
  AND token = 'GUT+FaKdgKzOmklUTyAZ1nk5sDFGmYiFaulyLlsU/iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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