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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d914f48982a007cb9eeb4c3f4de6f8e5ad04be133300153ab95eeeb78f5162c' 
  AND token = 'ZHNluSFKtssFf6vTZgkXJneQkiQ415hjInFoC6a9dDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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