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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e997561f247b9cce220c249a0896642d8417e94f01d60596d3c03fe6fd5d790' 
  AND token = '9x3yX/IOpxGd+f7JZOnPGLCmex2i3rLEqkhMGn53W0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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