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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd913e8fb8eddc859bdf9c96c56861e73c9e831e55f642e8ec085167210b72ab0' 
  AND token = 'B+bteqIl2lrZf1qLXaF8QbIqHVnGKWcttKnF3xjp3fY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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