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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4431145537dc0e006329b9b4a76f4cb84de1b3ea7e654dd11b8318ee9669a03' 
  AND token = 'ExZT0ZWCFmAlpP9VHYguRJtPA3k68j6opbsnKC4EZw4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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