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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6d3a305dc42cd4ee156ac1d8650149f0f63ed769d38be0dbc5db28fa4b9b74a' 
  AND token = 'aSfa1/zrfqI9uNSteAhCLWba/yyg9ahc3mTdVCA8GBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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