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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b89430f8ba1890434ae257352e5ef241f4fc8024c4c7d93406cd3114e946bd8' 
  AND token = '+Kn5rHV0V+c9H+N0hcKlXQPuOkFHzICpz4XUfE/Ji4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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