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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba41bbaeb155a4071396a93d8072fb652d6d36ab5edb476b9c41c02ccc0e99a2' 
  AND token = '/F7HyFn06JS1quKnRteuVieObWXil+RJN+XHjmMWnSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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