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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2afb594e211c689f90968605a64426069763bf21ced13f7863e8ee86eae82fdb' 
  AND token = '73FsDk9nPQ02iRVqgh9UbWg9qn55oJL/f5dsjtg9CGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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