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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '528a9259898aec42700454576a89b19335131e69c883499a4773f3e765664ad7' 
  AND token = 'ecwAF47p415sk80zy81jo41DsU+wbV7LmDjx2f/T6Xs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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