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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb34f09c64377fc3d826507bad8a28ec7b4edb60bfc1e8f8299f5d5908e2fb6f' 
  AND token = 'C5XwjwpRxzCtEtxJW4pHSf/v0FKeUs/ds1TUiRjW7V8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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