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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fad7feac8d6d9b8bceeabf48d7f3493a7c69be69bf1e85c8ec3967da08cbf06' 
  AND token = 'hc4aid+1gIzreuTQdJFMOgJQAZVJDCgChX0wXTfOQWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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