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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'baac048904a53542b8be8fb0913197352ed0dae0a0f4e99dfe4751007776d1ec' 
  AND token = 'WQ1xA13xDl5ERjR5d6ebXVeHAtFXiUGNW2LUxSjwZNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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