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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edb31a248961aacf2e6ad7e54109d243a6a33f61a6cef71fb36c7f35adc7ae5b' 
  AND token = 'PD3ZSyPXEmOmKLJoPHfg/MXlueHiyNNaNhK0RIYYnjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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