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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd26a30787172369bc15344764437196bc9f368c45f129d3f6ca8d732fc1155a8' 
  AND token = 'poB0ZHdd4i6Ed2gF5sZa72cR9AYnDkSUcQpYeGv5+Jw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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