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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70ae3ea23b0c7df8d1dea8cc06414915f3b0890bb6d5ee5c25a6d853748231e6' 
  AND token = 'Uhm9nDhwrTFUWodlnJIPnu9fJm+08j3422xu0T/+P0Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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