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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d36f9d624b515c1cf6e30d49961a48b3defbda307eb48517ee69c5b0c95858f' 
  AND token = '9EZbX90BBlKdBMmR+5Npabg2T+kFpEsDVZHzyV5gLxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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