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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65a5f8666e19fa38158a196e18a63ce5ea07106a5f604c5887b234921156850b' 
  AND token = 'm70EFM8UQaRreGmtVCDk2o8YDugrQX2B17dNrA35weo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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