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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '883e24c9485a974fb994abcd9c2610ed32111300179a4e8496ffce76546ea383' 
  AND token = 'sWKwFmMq8vxa+eoHTQfnjl7Yabpo/ZuCIfEktHvq7os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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