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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5a865604323a695c95a5cdcddad0e04cf23a749e1d29966cd6c359cf7511c80' 
  AND token = '3bYTDjY322U9+FNv1LGcT4SwB9Qqx7TrzEvVsiJPxO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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