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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5301ec58ff9b752c3eb2f36717ed017f7605c6995f99d75a43a3413baa777ee' 
  AND token = '6KvWMr8Yp74FPhXSGFXP99LCWSEidgqYM8vQs0I9t64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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