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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8af85dca84b20f619e68d00a2f8317c8fc8d52fecae1b22505a3e7ad1b93316f' 
  AND token = '+Dq3cb3qL5XlJk3bQQMKs1yAX2QTYkOOx9zip9N9PuE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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