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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e606a4eb89bf4bc39a00797cc9fc36d03edb6fe90b7c697faa9bd46ae48ae829' 
  AND token = '1Css1DF6tAuN3/EeNuPsHfub244fpMZYgqZMC0ewaMI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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