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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29723dc3475d5b00e847d120c66adbe612ec1819d2393cf97c796ca19cbc1292' 
  AND token = 'c4DVgFWerIIfw8As8hcUWXhzsGzfBr1NexVYhG7bs84=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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