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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '866449fbe4b34ae4c84195a7f7da72a94495cabbde84b7232d328333f9f663bb' 
  AND token = '7r6RNN3T7/u/6nHOj6CBYcgmTydC8ydyUt6Ql0b0RlU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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