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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebd4d97280ebbf85198538a6f2633e2273dc4d5dee6a06c99fad93cab8e8f4c9' 
  AND token = 'viJUziZHC1qXquDZM7UzuRTw8LbNNWYNE6waM/U6oRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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