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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97899320d23408edea609d10db33cf9f148b5baa43a783f8cc1a43a1d5585ca4' 
  AND token = 'WBiZDRdG3lOZNYes2R2E6Swlm1zmt6o5UEOeL38rtrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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