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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba3c55b125773a75c751052a75078fee9be5a5b898bf69faef1fac90bec1f29d' 
  AND token = 'gJ0XIqknihBgQv8z5Fz6ZfUM7YluDthfmEwefq5KB4k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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