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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41859138b3cd04d5c47996e9a565c7809cea910546cdc05f406e499faef05227' 
  AND token = '6nCgskJOoVnAGv4nGVKn22a3sni139ntSDbwJNhuAxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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